<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app">
        <ul>
            <li v-for="(item,index) in arr" :key="index">{{item}}</li>
        </ul>

        <button @click="arr = arr.reverse()">走一走</button>

    </div>




    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script >
        new Vue({
            data:{
                arr:['帅哥','美女','程序员']
            }
        }).$mount('#app')
    </script>
</body>
</html>